I have a CO2 tank that was recently cert'd and would like to re-valve it for N2O. Does anyone know of a source for CGA660 these valves in single quantity at a reasonable price? All I've found so far is quantities of 25 or more which I could never use, nor afford.  And 'racing' valves which go for over 100 bux each plus they never list (or know) the input threads on the bottle side. Industrial ones are typically around 15 bux if I could just find someone to sell it to me in single quantities.
 
The specific valve I'm looking for is a CGA 660 oulet, with 3/4" NGT - 14 bottle side connection so I can finally get my tank filled and do some testing.
 
Thanks  for any suggestions
 
Tim